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could be clogged fuel injectors or fuel filter could be plugged or your fuel pump is weak and needing replaced,what makes fuel pumps go bad in most vehichles is driving with less than a 1/4 tank of gas,it gets the fuel pump hot and works it too hard

i had the same problem on my 94 silverado. it was the ignition control module under the distributor cap. advance auto will test it for free. the icm controls the spark and the injectors. quick fix for around $45 and 10 minutes.

I believe a 94 astro has a cpi system this is a central injector with 6 tubes with poppet valves this located inside of the intake manifold,the top half of the plenum comes off and then the central injectoris inside,make sure your fuel pressure is up to spec also

undo the fuel line where it joins the fuel rail to your injectors.. it is under extreme pressure so be careful.. get someone to crank car for a second or two and if fuel sprays out then its not a fuel problem..

What are the readings. Need to know the co and the hc reading in order to know if you have a misfire or an over fueling issue. All 5 reading are really needed to diagnose fuel related issues sight unseen

Check for any wiring pinch which might have occurred when the injector was replaced. The injector is driven directly by the computer, so it seems to point at the new computer as being faulty. (pulse signal is always 'on')